This PR adds a small check if the VSS provider fails to initialize. We already checked if the user appears to have the `SeBackup` privilege and tailor the message to that.
With this PR we now also factor in a potentially missing VC Redist package, such that the user is informed about this package not being found.
The intention is to point towards the most likely cause of the failure. If VSS works, or not running on Windows, nothing has changed.
Kenneth Skovhede
977bb88263